Here is the Windows 10 PC 10586.104 cumulative update complete changelog:
  • Fixed issues with authentication, update installation, and operating system installation.
  • Fixed issue with Microsoft Edge browser caching visited URLs while using InPrivate browsing.
  • Fixed issue that didn’t allow simultaneous install of apps from the Windows Store and updates from Windows Update.
  • Fixed issue that delayed the availability of songs added to the Groove Music app in Windows 10 Mobile.
  • Improved security in the Windows kernel.
  • Fixed security issues that could allow remote code execution when malware is run on a target system.
  • Fixed security issues in Microsoft Edge and Internet Explorer 11 that could allow code from a malicious website to be installed and run on a device.
  • Fixed additional issues with the Windows UX, Windows 10 Mobile, Internet Explorer 11, Microsoft Edge, and taskbar.
  • Fixed additional security issues with .NET Framework, Windows Journal, Active Directory Federation Services, NPS Radius Server, kernel-mode drivers, and WebDAV.